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visits member for 3 years, 11 months
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Started programming on a ZX spectrum in the 80's and have moved through Assembly, Turbo Pascal, C++, C#, Fortran. My main area of focus is engineering and scientific computing like numerical methods and 3D graphics.


Sep
10
comment Angular acceleration and linear acceleration
Do you understand that all points share the same angular rotation, but have different linear velocity? From this you can see how accelerations (being the derivatives of velocities) are similar in this way.
Sep
10
comment Why do I get inconsistent answers with the kinematics equations?
Is time=0 initially? It could be any value as long as the final time is 1.5s.
Sep
10
awarded  Guru
Sep
10
comment Add air resistance to projectile motion
What tool do you have to answer this question? Do you have excel, mathematica or maple, or some other programming environment? Doing this by hand (old school like) is rather tedious. Just ask the WWII army math department which did this all day long.
Sep
10
revised What are washers for?
added 84 characters in body
Sep
10
comment Add air resistance to projectile motion
I think the OP does not know how to simulate the above equations (even with the most basic Euler method) and so maybe you can add a reference to this step in your answer to get him/her pointed in the right direction.
Sep
10
comment What are washers for?
@jnovacho. Thanks the answer is a community wiki so it can be edited by anyone I think to add or change items.
Sep
10
revised What are washers for?
added 9 characters in body
Sep
10
awarded  Good Answer
Sep
10
comment Hoop rolling inside a circular hole
Similar to physics.stackexchange.com/q/93744/392
Sep
9
comment What are washers for?
Yes, there is a cut in the washer which creates an edge for the washer to dig in.
Sep
9
awarded  Nice Answer
Sep
9
answered What are washers for?
Sep
9
comment What are washers for?
The area is increased because the washer is bigger than the nut.
Sep
9
comment What are washers for?
If bolting on a soft material (like aluminum) a washer will prevent the head and nut from "digging in" and damaging the material.
Sep
8
comment How does a knife cut things at the atomic level?
Holy molly what a great answer. This is why I love this website.
Sep
7
comment Normal modes of the 2D double pendulum
+1 This is a really good question, since the motion is part periodic and part chaotic.
Sep
7
comment Why are orbits elliptical?
A generalization of this question is why are two body orbits conic sections?
Sep
4
comment Tensor of inertia
The inertia tensor in general is found by $$I = -\int \rho [\vec{r}\times][\vec{r}\times]\,{\rm d}V$$ where $[\vec{r}\times]$ is the 3×3 matrix cross product operator
Sep
4
comment Finding directions of the internal forces within a freely jointed rigid object?
If you where holding BC (instead of the bar AB) then you would be pulling to the left and up to keep the equilibrium.